use rustc::lint::*;
use rustc_front::hir::*;
use reexport::*;
+use semver::Version;
use syntax::codemap::Span;
use syntax::attr::*;
-use syntax::ast::{Attribute, MetaList, MetaWord};
+use syntax::ast::{Attribute, Lit, Lit_, MetaList, MetaWord, MetaNameValue};
use utils::{in_macro, match_path, span_lint, BEGIN_UNWIND};
/// **What it does:** This lint `Warn`s on items annotated with `#[inline(always)]`, unless the annotated function is empty or simply panics.
declare_lint! { pub INLINE_ALWAYS, Warn,
"`#[inline(always)]` is a bad idea in most cases" }
+/// **What it does:** This lint `Warn`s on `#[deprecated]` annotations with a `since` field that is not a valid semantic version..
+///
+/// **Why is this bad?** For checking the version of the deprecation, it must be valid semver. Failing that, the contained information is useless.
+///
+/// **Known problems:** None
+///
+/// **Example:**
+/// ```
+/// #[deprecated(since = "forever")]
+/// fn something_else(..) { ... }
+/// ```
+declare_lint! { pub DEPRECATED_SEMVER, Warn,
+ "`Warn` on `#[deprecated(since = \"x\")]` where x is not semver" }
#[derive(Copy,Clone)]
pub struct AttrPass;
impl LintPass for AttrPass {
fn get_lints(&self) -> LintArray {
- lint_array!(INLINE_ALWAYS)
+ lint_array!(INLINE_ALWAYS, DEPRECATED_SEMVER)
}
}
impl LateLintPass for AttrPass {
+ fn check_attribute(&mut self, cx: &LateContext, attr: &Attribute) {
+ if let MetaList(ref name, ref items) = attr.node.value.node {
+ if items.is_empty() || name != &"deprecated" {
+ return;
+ }
+ for ref item in items {
+ if let MetaNameValue(ref name, ref lit) = item.node {
+ if name == &"since" {
+ check_semver(cx, item.span, lit);
+ }
+ }
+ }
+ }
+ }
+
fn check_item(&mut self, cx: &LateContext, item: &Item) {
if is_relevant_item(item) {
check_attrs(cx, item.span, &item.name, &item.attrs)
}
}
}
+
+fn check_semver(cx: &LateContext, span: Span, lit: &Lit) {
+ if let Lit_::LitStr(ref is, _) = lit.node {
+ if Version::parse(&*is).is_ok() {
+ return;
+ }
+ }
+ span_lint(cx,
+ DEPRECATED_SEMVER,
+ span,
+ "the since field must contain a semver-compliant version");
+}